Clock



FIG. 1 is a perspective view of a clock showing my new design;

FIG. 2 is a front elevation thereof;

FIG. 3 a rear elevational view thereof.

FIG. 4 is a left side elevational view thereof.

FIG. 5 is a right side elevational view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in FIGS. 3 through 7 are for illustrative purposes only and do not form part of the claimed design. 

The ornamental design for a clock, as shown and described. 